What does purchasers think about their new mission to use sustainable demands in public procurements? Even though the law allows environmental and social demands in procurement, the process is very complex. It depends on the co-operation between several different actors within and between organizations. It also depends upon a changed view on the relationship between public procurement and sustainable development. The purchasers must feel responsible for sustainability issues within their expertise. Earlier studies show that all organizations meet different hinders when they change their mission. Focus in this study is on Malmoe and Upphandlingsenheten where the municipality-purchasers work. The empirical data was collected with qualitative methods by semi-structured interviews with five employees. Results show that there are several challenges to implement “green procurement”. First of all the individual goals that the co-workers have must match with the organizational goals. This study shows good examples of how the purchasers have met some of those challenges. The employees also have ideas of how other challenges may be possible to overcome. One possibility could be to co-operate with other municipalities around sustainability to create mutual demands. This could create a greater pressure on suppliers.